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Commit 74c850da authored by Hemant Kumar's avatar Hemant Kumar Committed by Vamsi Krishna Samavedam
Browse files

usb: host: xhci: Enable pull-down on DP while port reset 



Enable external pull down on DP line while port reset in progress.
This helps to reduce the voltage on D+ line in case of a high
speed detection handshake.

Change-Id: I68991d6a3dc7227036bf111c04f10ef75daa4b26
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
Signed-off-by: default avatarVamsi Krishna Samavedam <vskrishn@codeaurora.org>
parent 2bb3bdf3

drivers/usb/host/xhci-hub.c

+6 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/gfp.h>

#include <linux/slab.h>

#include <asm/unaligned.h>

#include <linux/usb/phy.h>



#include "xhci.h"

#include "xhci-trace.h"
@@ -1065,6 +1066,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 
	u16 wake_mask = 0;

	u16 timeout = 0;

	u16 test_mode = 0;

	enum usb_device_speed s = hcd->self.root_hub->speed;



	max_ports = xhci_get_ports(hcd, &port_array);

	bus_state = &xhci->bus_state[hcd_index(hcd)];
@@ -1314,6 +1316,10 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, 
			writel(temp, port_array[wIndex]);



			temp = readl(port_array[wIndex]);



			if (s == USB_SPEED_HIGH)

				usb_phy_start_port_reset(hcd->usb_phy);



			xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);

			break;

		case USB_PORT_FEAT_REMOTE_WAKE_MASK: